1001011112221 has 4 divisors (see below), whose sum is σ = 1001014753600. Its totient is φ = 1001007470844.

The previous prime is 1001011112203. The next prime is 1001011112281. The reversal of 1001011112221 is 1222111101001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001011112221 - 2³⁷ = 863572158749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001011112281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1371381 + ... + 1970458.

It is an arithmetic number, because the mean of its divisors is an integer number (250253688400).

Almost surely, 2^{1001011112221} is an apocalyptic number.

It is an amenable number.

1001011112221 is a deficient number, since it is larger than the sum of its proper divisors (3641379).

1001011112221 is an equidigital number, since it uses as much as digits as its factorization.

1001011112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641378.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1001011112221 its reverse (1222111101001), we get a palindrome (2223122213222).

The spelling of 1001011112221 in words is "one trillion, one billion, eleven million, one hundred twelve thousand, two hundred twenty-one".